Safety device for internal-combustion engines.



.PATENTED JUNE 16, 1908. J. D. MAOPHERSON. SAFETY DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED AUG. 26, 1906.

2 SHEETSSHEET l.

, v S Iv V INNkL-i fl 7 $2: I as No. 890,674. PATENTIEID JUNE 16, 1908 .J. D. MAUPHERSON. SAFETY DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED AUG. 25, 1906.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

. i n JAMES D. MACPHERSON, OF NEW YORK, N. Y., ASSIGNOR TO AMERICAN DIESEL ENGINE COMPANY, OF NEW YORK, "N. Y., A CORPORATION OF NEW YORK.

' SAFETY DEVICE FOR IN TERNAL-COMBUSTION ENGINES.

No. 890,674. Specification of Letters Patent. Patented June 16, 1908 Application filed August 25, 1906. Serial No. 331,969.

To all whom it may concern: valves 4 'in their closed positions. The sev- Be it known that I, JAMES D. MACPHER- l eral extended valve-stems are actuated by SON, a citizen of the United States, and rethe rollers of the oscillating valve-actuating siding in the city, county, and State of New I levers 7, which are mounted upon an en- 5 York, have invented certain new and useful larged eccentric portion of the rock-shaft 8, so Improvements in SafetyDevices for Internal i the latter being carried thebracket, and Combustion Engines, of which the following, l the front ends of the three levers are connecttakenin connection with the accompanying ed by the rods 9 with the crank-mechanism drawings, is a full, clear, and concise specifi- "10 which operates the pumping plungers. I

10 cation. I The engine governor 11, of ordinarycon- 65 My invention'relatesto safety devices for struction, is connected by means of the gov internal combustion en ines, and more par.- ernor lever 12 and link 13 with the rockticularly to engines'whic employ fuel pum s shaft 8 and is adapted to rock the same in its automatically controlled in respect of ebearings and thereb effect a shifting of the 15 livery of fuel in accordance with the load on fulcrum support of the valve actuating levers 70 the engine. In the fuel pump to which-my 7 as above ou-tlined,and, dependin' upon the invention is specially suited the induction speed. of the governor, the time an period of valves of the pumpin mechanism are actut e engagement of the levers with their reated by oscillating vaive levers, mounted on spective valve-stems will be greater or less,

a shiftable fulcrum, and the. control of the so that the amount of fuel delivered through 75 pump is effected by a'centrifugal governor the eduetionvalve mechanism to the engine driven by the -engine,- which raises or lowers will be in accordance with the requirements the said fulcrum and thereby controls the of the latter. time and period of the valve operations. In case of the accidental disconnection of he urpose of the invention is to render the governor from the rock-shaft 8, the con- 80 the fuel pump inoperative upon the failure of trol of the latter upon the pump valves will its controiling means, as by the accidental obviously be lost and serious injury to the disconnection of the governor from the ,fulentire plant may ensue if the attendant doescrum rock-shaft, such as might-occur in varinot happen to be on hand. By in invenous ways but is most common to occur from tion, however, I overcome this he ilit 0f85 the working loose of screw-threaded connecaccident by applying to the means w ich tions. connect the governor with the valve-actua- In the accompanying drawin s, Figure 1 is tors a weighted safety device arranged to exa'side elevation of a three cyliii er fuel pump ert a constant pressure on the saidconnecting such as used'on Diesel engines, with the cenmeans in a direction'tending to render -the 90 tral pumping cylinder and adjacent parts in valve mechanism inoperative, so that upon vertical section and containin my invention; the occurrence of such a disconnection the Fig. 2 is a plan View thereo with the govdevice itself assumes control and -brin ernor in horlzontal section on the line 11-11 about the slowing down or stop age of the 40 of Fig. 1; and Fig. 3 is an enlarged detail of engine. In the specific form: s fiown, this '95 the safety device. device consists 'of-a flatbar 14 which is suithe pum ing apparatus com rises, briefly, ably bored and slotted so that it =canbe a cylinder orging 1, provide with one or rigidly'connected or pinned to theend of the more cylinder bores as the case may be, three rock-shaft 8. Its shorter arm constitutes a in the present instance, and containing crank for the rock-shaft, to which crank-arm pumping plungers2workin in the lower ends the lower end of the link 1,3 is pivotally conthereof. The eduction va ve mechanism is nected. Its other 'endtextends upwardly in v shown at 3 and the induction valves 4, with about the position shown'in Fig. 1 and preftheir aokings, are shown at the top of the erably terminates in an enlargement which 50 cylin ers with their valve stems extended serves as a Wei ht ,exertinga normal tendvertically upward and guided by the cross ency on the rocishaft to turn it in a rightbar 5, of a bracket, secured to the back of the handed direction, or so asqto depress the fulcylinder forging 1. A spiral s ring 6 located crum of the valve-levers 7. The depression between the cross-bar 5 and t e heads of the of the shifting fulcrum upon the disconnec-v 55 extensions, serves to keep the induction tion of the governor will so lower the valve It will be understood that I do not confine my invention to the specific form or arrangement of the weighted crank-arm, nor indeed do I confine my lnvention to the use of a Weight as the means for rendering the valve mechanism inoperative, inasmuch as it is obvious that a spring could servethe same pur ose with equal effect.

aving described my invention, What I claim and desire to secure by Letters Patent is-as follows-:-

1. In a fuel pum for internal combustion engines; a shifting ulcrum and valve actuating means mounted thereon, in combination With an engine governor controlling the position of said fulcrum, and a safety device acting upon'said shifting fulcrum and adapted to shitt'it to its inoperative position uponthe failure of said governor.

2. In a fuel pump for internal combustion engines, a rock-shaft forming a shifting fulcrum and valve actuating means carried thereon, in combination with a weighted crank arm on said rock-shaft and an engine governor connected to said arm and adapted to shift the fulcrum therethrough, the wei ht of said arm being arranged to shift the fillcrum to inoperative position upon the disconnection 0' said governor. therefrom.

3. In a fuel pump for internal combrstion engines, having a shiftable rock-shaft, fulcrum and valve controlling means mounted thereon, a safety attachment adapted to be connected to said rock-shaft and havin one end adapted to serve as a weight am the 40 JAMES n. MAcPn'Eas-os.

Witnesses THEoDoRE LUCAS,

HUeo BRIEDRICHS. 

